FS#106 - AppData corruption

The appdata folder was corrupted on my SD card from an unclean eject this made the folder read only until i ran a repaired it. MiniMenu still displayed all my PND files.
When clicking to launch the app would try to load crash and then return to MiniMenu without any visible error. This was pretty confusing and i thought it might be a good fix for a troubleshooting guide.